- Preheat oven to 350F. - Trim the stalks of the french beans and the mangetout keeping both separate. Boil water in a large pan. A large pan will preserve the color of the french beans. - Blanch the french beans for 4 mins. Then take out and put in a dish full of ice cold water. Take the mangetout and boil 1 min. Place the mange tout in iced water too. - While the beans are cooking, scatter the hazelnuts in a large roasting tray and roast for 10mins. Leave until cool enough to handle, then rub them in a clean tea-towel to get rid of most of the skin. Chop the nuts up roughly. - Make the dressing and mix all the ingredients . I used a zester for the orange. Place the french beans and mangetout in a large serving bowl and mix in the dressing. I did this about an hour before the guests came for dinner and it was perfect. Serve at room temperature. The next day I used the left overs with farro.